linux-kernel - Re: [PATCH] [23/31] HWPOISON: add memory cgroup filter

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Date:	Thu, 10 Dec 2009 02:42:12 +0100
From:	Andi Kleen <andi@...stfloor.org>
To:	Paul Menage <menage@...gle.com>
Cc:	Andi Kleen <andi@...stfloor.org>, kosaki.motohiro@...fujitsu.com,
	hugh.dickins@...cali.co.uk, nishimura@....nes.nec.co.jp,
	balbir@...ux.vnet.ibm.com, kamezawa.hiroyu@...fujitsu.com,
	lizf@...fujitsu.com, npiggin@...e.de, fengguang.wu@...el.com,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH] [23/31] HWPOISON: add memory cgroup filter

> While the functionality sounds useful, the interface (passing an inode
> number) feels a bit ugly to me. Also, if that group is deleted and a
> new cgroup created, you could end up reusing the inode number.

Please note this is just a testing interface, doesn't need to be
100% fool-proof. It'll never be used in production.

> 
> How about an approach where you write either the cgroup path (relative
> to the memcg mount) or an fd open on the desired cgroup? Then you
> could store a (counted) css reference rather than an inode number,
> which would make the filter function cleaner too, since it would just
> need to compare css objects.

Sounds complicated, I assume it would be much more code?
I would prefer to keep the testing interfaces as simple as possible.

-Andi
-- 
ak@...ux.intel.com -- Speaking for myself only.
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